Portion of an engine



FIG. 1 is a top plan view of a portion of an engine according to the present design;

FIG. 2 is a rear elevation view of the portion of an engine shown in FIG. 1;

FIG. 3 is a front elevation view of the portion of an engine shown in FIG. 1;

FIG. 4 is a left side elevation view of the portion of an engine shown in FIG. 1;

FIG. 5 is a right side elevation view of the portion of an engine shown in FIG. 1; and,

FIG. 6 is a perspective view of the portion of an engine shown in FIG. 1.

The broken lines shown herein are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of an engine, as shown and described. 